Mark D.

I am a maths teacher from England - hence I spell things like colour and centre correctly! I came across the site by chance and enjoy doing maths and it's good to help people.


5,037,993 students helped

Level 15 in Algebra Level 11 in Geometry Level 10 in Precalculus Level 9 in Statistics Level 6 in Trigonometry Level 5 in Prealgebra Level 4 in Calculus Level 2 in Chemistry Level 1 in English Grammar